Sources — Balai selaso jatuh kembar

Every dimension the house is generated from is below, with its class and its citation. This is the project’s honesty layer, and it is given a room of its own because a smooth 3D render implies a precision the sources do not have.

The dimensions

Dimension	Value	Class	Citation
Width of the middle room, where the council sits.middleWidth	6.40 mIf 20% out: 1.28 m	Interpolated	No source
Length of one bay along the hall.bayLength	2.50 mIf 20% out: 2.50 m	Interpolated	No source
Width of each selaso. The two are the same, because that is what kembar in its name means.aisleWidth	2.20 mIf 20% out: 0.88 m	Interpolated	No source
How far the selaso floor falls below the middle one. It is the only dimension in this project that lowers a floor in order to say something, and what it says is about an activity rather than about a person.selasoDrop	0.32 mIf 20% out: 0.06 m	Interpolated	No source
How high a single step can be and still be crossed without thinking about it. Not from a source about Riau — its own source key so that this shows. The fall has to stay inside it, because people cross it many times in one meeting.stepLimit	0.42 mIf 20% out: 0.08 m	Interpolated	Ukuran tubuh manusia yang ditetapkan penulis, bukan dari sumber tentang Melayu Riau. Kunci yang sama dipakai pak Bali, Waruga, Ngada, Atoni, Rimba, dan Sahu.
Height of the middle floor above the ground.floorHeight	1.35 mIf 20% out: 0.27 m	Interpolated	No source
Height of the stone under a post; nothing is buried.padHeight	0.30 mIf 20% out: 0.06 m	Interpolated	No source
Depth of the hollow in the stone the post foot sits in, so the two actually engage.padSocket	0.05 mMoves no measurement	Interpolated	No source
Section of a post.postSection	0.19 mMoves no measurement	Interpolated	No source
Depth of a floor bearer.bearerDepth	0.20 mMoves no measurement	Interpolated	No source
Thickness of a floor plank.deckThickness	0.05 mMoves no measurement	Interpolated	No source
Height of the low rail at the edge of the selaso. Low on purpose: a selaso is a way through, and a way through is not closed off.railHeight	0.75 mMoves no measurement	Interpolated	No source
Height of the middle room’s board wall to the plate.wallHeight	2.50 mIf 20% out: 0.50 m	Interpolated	No source
Thickness of a wall board.wallThickness	0.06 mMoves no measurement	Interpolated	No source
Rise of the anjung floor above the middle one. A Minang rumah gadang also raises a floor at its ends, and there what is stated is which laras the household follows; here what is raised is where the hosts sit at a ceremony.anjungRise	0.28 mMoves no measurement	Interpolated	No source
Depth of an anjung at the end of the hall.anjungDepth	2.80 mMoves no measurement	Interpolated	No source
Depth of the rear deck.pelantarDepth	2.40 mMoves no measurement	Interpolated	No source
Rise of the ridge above the plate.roofRise	3.40 mIf 20% out: 0.68 m	Interpolated	No source
Length of the ridge against the length of the hall.ridgeShare	0.50Moves no measurement	Interpolated	No source
Overhang of the roof, which shades the selaso under it.eaveOversail	1.10 mMoves no measurement	Interpolated	No source
Thickness of the shingle covering.roofThickness	0.10 mMoves no measurement	Interpolated	No source
Height of the selembayung crossing at the end of the ridge. Its carving itself is not modelled.selembayungHeight	1.10 mMoves no measurement	Interpolated	No source
Section of a selembayung member.selembayungSection	0.09 mMoves no measurement	Interpolated	No source
Radius of the hall’s yard, beside the river that is this country’s road.yardRadius	14.00 mMoves no measurement	Interpolated	No source
Depth of the tested joint engagement, as a share of the smaller member.jointEngagement	0.30Moves no measurement	Interpolated	No source
The selaso floor falls one step below the middle floor. Every other stepped floor in this project is raised to say something about the person standing on it — a rumah limas seats a guest on the step matching their standing, a rumah gadang raises an anjuang according to its laras, a malige lifts a storey for a sultan. This one is lowered to say something about an activity: passing through is not being present, so the way through is not on the level of the room.theAisleHasFallen	1Moves no measurement	Canon	Arsitektur Tradisional Daerah Riau (Departemen Pendidikan dan Kebudayaan, Jakarta, 1986).
Two selaso, and they are alike: the same width, the same fall, on both sides. That is what kembar in its name means, and a hall with one selaso, or with two at different levels, is a different building with a different name.twinAndAlike	2Moves no measurement	Canon	Effendy, T., Tunjuk Ajar Melayu (Balai Kajian dan Pengembangan Budaya Melayu, Yogyakarta, 2004).
The fall is one step, not one storey. People cross it many times in a single meeting, so it has to stay inside the size of step somebody crosses without thinking — which is this building’s limit, and the limit is in a person’s body rather than in its timber.oneStepNotAStair	1Moves no measurement	Canon	Wahid, J. & Alamsyah, B., Arsitektur & Sosial Budaya Sumatera Utara dan Melayu (Graha Ilmu, Yogyakarta, 2013).
Both selaso run clear from end to end, so somebody can walk the whole length of the hall without once setting foot in the middle room. This is the measurable half of what the fallen floor means.youPassWithoutEntering	1Moves no measurement	Canon	Effendy, T., Tunjuk Ajar Melayu (Balai Kajian dan Pengembangan Budaya Melayu, Yogyakarta, 2004).

Bibliography

depdikbud-1986 · reference
Arsitektur Tradisional Daerah Riau (Departemen Pendidikan dan Kebudayaan, Jakarta, 1986).
effendy-2004 · reference
Effendy, T., Tunjuk Ajar Melayu (Balai Kajian dan Pengembangan Budaya Melayu, Yogyakarta, 2004).
wahid-2013 · reference
Wahid, J. & Alamsyah, B., Arsitektur & Sosial Budaya Sumatera Utara dan Melayu (Graha Ilmu, Yogyakarta, 2013).
anthropometry · none
Ukuran tubuh manusia yang ditetapkan penulis, bukan dari sumber tentang Melayu Riau. Kunci yang sama dipakai pak Bali, Waruga, Ngada, Atoni, Rimba, dan Sahu.

Which of these matters most

Nearly every dimension on this page is the author’s own. What the provenance bar does not say is whether that matters. Each row below is computed by rebuilding the house: one dimension is pushed 20%, and the house is measured to see how far it follows. Nothing is estimated — the figures are the difference between two runs of the generator.

1bayLength2.50 mlength of the hall
2middleWidth1.28 mwidth over all
3aisleWidth0.88 mwidth over all
4roofRise0.68 mheight of the ridge
5wallHeight0.50 mheight of the ridge
6floorHeight0.27 mheight of the ridge
7stepLimit0.08 mmargin against a single step
8selasoDrop0.06 mthe fall of the aisle floor

If only one dimension could be surveyed, this is the one. This is sensitivity, not uncertainty: it shows what moves, not how likely the value is to be wrong. The 20% is itself the author’s choice.

Invariants

There is no measured drawing yet, so correctness rests on structural truth. These checks fail the build.

pass
Bilateral symmetry about Symmetric about the axis of the hall, x = 0 — and that is what kembar in its name means
672 points; largest mirror deviation 0.00 mm.
pass
Every tenon contained in its mortise
26 pasak, takik and tumpu joints; every one engaged.
pass
No joint spans more than one stage
Every joint engages two parts from the same stage or from consecutive ones.
pass
Stage ordering, and nothing below ground
83 parts, every one bearing on something already standing or on the ground.
pass
Mesh integrity: indices, triangles, normals
6 triangles; indices in range, none degenerate, every normal unit length.
pass
Both aisles have fallen, and fallen the same
Two selaso, each 2.20 m wide, both fallen 32 cm below the middle floor. Every other stepped floor in this project is raised to say something about a person; this one is lowered to say something about an activity.
pass
The fall is one step, not a storey
A 32 cm fall against the 42 cm a person crosses without thinking about it. People cross it many times in one meeting: one figure belongs to the custom, the other to the body, and nothing relates them.
pass
You can walk the length of the hall without entering the room
Both selaso run clear for 12.5 m, with only a low rail on their outer edge and nothing across them. This is the measurable half of the fallen floor: passing through is not being present.
pass
What is raised is raised only at the ends
2 anjung, both outside the middle room and 28 cm above it. The middle floor itself stays one plane: a raised floor inside the room would be the rumah limas’s claim, and this building does not make it.
pass
Every part declares the dimensions it came from
83 parts, every one tagged. By least-sourced input: 0 measured, 0 canon, 83 interpolated.
skipped
Checked against a measured drawing of a real house
Skipped. No measured drawing has been wired in, so there is nothing to compare against. This check will not be made to pass by weakening it.

What a check is preventing

Ten green rows are not a reason to believe anything. So one check is run against a house built to break it, and what is printed below is that check’s own verdict rather than a description of it.

Dropping the selaso further is the most direct way to make this building say what it means more clearly: the difference between passing through and being present is the whole content of the plan, and a deeper fall states it from further away. No part of the building objects — the two aisles are still twins, still clear end to end, the roof still covers all three floors. What runs out is the step. People cross that edge many times in one meeting, and past a point it is no longer something crossed without thinking — so the hall that states its point most firmly is the hall whose aisles people stop using as the way through.

The house as built

pass32 cm / 42 cmthe fall of the floor · a single step

A 32 cm fall against the 42 cm a person crosses without thinking about it. People cross it many times in one meeting: one figure belongs to the custom, the other to the body, and nothing relates them.

Rear prow raised to 0.43 m

fail43 cm / 42 cmthe fall of the floor · a single step

the fall is 43 cm and a single step is at most 42 cm

The second house is never rendered. It is built during the build, failed, and thrown away.

This bar moves as real surveys are wired in. That movement is the project's progress metric.